ELECTRICALLY DRIVEN PUMP

An electrically driven pump is provided, which includes an impeller. The impeller includes an upper plate, blades and a lower plate, and the blades and the upper plate are integrally formed by injection molding. The blades are formed on a lower surface of the upper plate, the blades include first blades and second blades, and a length of each of the first blades is greater than a length of each of the second blades. The first blades are uniformly distributed along a circumference of the upper plate, and the first blades and the second blades are distributed alternately in a circumferential direction of the upper plate. Each of the first blades includes a first head portion and a first tail portion, the second blade includes a second head portion and a second tail portion, and each of the first tail portion and the second tail portion is aligned with an outer edge of the upper plate. The outer edge of the upper plate defines a first circumference with a diameter of ¦1, the second head portions of the second blades are located on a second circumference with a diameter of ¦2, and the diameter ¦2 of the second circumference ranges from 60 percent to 75 percent of the diameter ¦1 of the first circumference. The impeller arranged in such manner facilitates the improvement of a hydraulic efficiency and a lift.